下列各句都有一处错误，找出并改正
1. Whose are the jeans? It's mine.
2. Are these cards yours? Yes, they're.
3. Where're her trousers? Their're under the bed.
4. Hi, Peter. Who's this basketball?
5. What colour are the oranges? They're oranges.
6. There are a table and two chairs in the room.
7. I don't have some new documents.
8. There is a "h" in the word "hair".
9. Ann's shoes is very nice.
10. Do your friend have a walkman?
